In C4 and CAM plants carbon dioxide is fixed in the _____ of mesophyll cells.
a. stoma
b. cytoplasm
c. thylakoids
d. stroma
e. grana
Answer: b. cytoplasm
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DNA vaccines ____
a. use RNA to assist in the transformation process b. have been created but are ineffective c. show promise in animal studies and are now in clinical trials d. have been approved by the government to fight several diseases e. sometimes infect the subject with the disease it's attempting to fight
Which of the following statements is false?
a. A female has more oocytes before she is born than at any time during her life. b. Meiosis II will not occur in an oocyte unless it is fertilized. c. Fertilization occurs in the vagina. d. Implantation occurs in the uterus. e. The vagina serves as the birth canal.
Molecular data can be used to assess relationships among the major groups of living organisms whose common ancestors lived millions or billions of years ago. Similar techniques can be used to assess relationships among populations within a species. How
can molecular techniques be useful for such varied comparisons? A) Studying the relationships among different populations of a single species can be just as effective as studying the relationships of major biological groups if you look at a lot more genes. B) Faster-evolving gene sequences provide better data for comparisons among close relatives, whereas very slowly evolving sequences work best for distantly related taxa. C) The relationships between very different groups, such as bacteria and whales, are assessed using mtDNA sequences, whereas rRNA sequences are used for very closely related groups.
Which of the following diseases may be reduced by improved public sanitation measures?
A) malaria B) HIV C) cholera D) chickenpox E) rabies